package/python-greenlet: enable as host package

While currently there is no in-tree Buildroot package which depends on
host-python-greenlet, we (Adder Technology) have some proprietary
modules that use it as part of their builds.

I've tested python-greenlet as host package and confirmed that it builds
and works correctly. Someone else might require it, so I'm proposing its
inclusion.

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/Config.in.host

@@ -69,6 +69,7 @@ menu "Host utilities"
 	source "package/pwgen/Config.in.host"
 	source "package/python/Config.in.host"
 	source "package/python-cython/Config.in.host"
+	source "package/python-greenlet/Config.in.host"
 	source "package/python-lxml/Config.in.host"
 	source "package/python-six/Config.in.host"
 	source "package/python-xlrd/Config.in.host"

package/python-greenlet/Config.in.host

@@ -0,0 +1,7 @@
+config BR2_PACKAGE_HOST_PYTHON_GREENLET
+	bool "host python-greenlet"
+	help
+	  Greenlets are lightweight coroutines for in-process concurrent
+	  programming.
+
+	  https://greenlet.readthedocs.io/

package/python-greenlet/python-greenlet.mk

@@ -12,3 +12,4 @@ PYTHON_GREENLET_LICENSE = MIT, PSF-2.0
 PYTHON_GREENLET_LICENSE_FILES = LICENSE LICENSE.PSF
 
 $(eval $(python-package))
+$(eval $(host-python-package))